Alzeng contributed to the MegaKill-ULTRA repository by developing features that enhance the end-game experience and player interaction. He implemented a complete end-game sequence, including a cutscene and transition to an end screen, using Unity and C# scripting to manage state and asset loading for a seamless player journey from gameplay to closure. Additionally, he created a modular PlayerInput system leveraging Unity’s UI and TMP_InputField, enabling the game to capture and validate user responses for interactive endings. His work focused on robust state management, UI integration, and animation, laying a foundation for improved player engagement and future extensibility.